Table of Contents

1 Overview
      1.1 Scope
      1.2 Purpose
2 References
3 Definitions
4 Test methods
      4.1 Direct measurement by fiber-optic detectors
      4.2 Direct measurement by thermocouples
      4.3 Prototype test data
      4.4 Test windings
5 Mathematical models to predict temperature
      distributions and hottest-spot rises
      5.1 Fundamentals
      5.2 Radiator or heat exchanger heat transfer
      5.3 Fluid flow within the winding
      5.4 Fluid flow between heat exchangers and winding
      5.5 Low distribution
      5.6 Conduction heat transfer
      5.7 Considerations for core-form power transformers
      5.8 Considerations for distribution and small power
             transformers
6 Determination of hottest-spot rise from production
      thermal tests without direct measurement of hottest-
      spot temperature
7 Documentation and acceptance criteria
Annex A (informative) - Bibliography on experimental testing
                        to predict or confirm transformer
                        thermal performance
Annex B (informative) - Bibliography on modeling of transformer
                        thermal performance
Annex C (informative) - Determination of hottest-spot rise from
                        tests without direct measurement
Annex D (informative) - Typical installation examples for
                        fiber-optic probes

Abstract

Covers mathematical test programs and models determining the steady state maximum (hottest-spot) and average winding temperature rise over ambient for all liquid-immersed distribution, network, power and regulating transformers manufactured in accordance with IEEE C57.12.00-2000.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Institute of Electrical & Electronics Engineers
Pages
ISBN
Supersedes	IEEE DRAFT 1538 : D3.0 MAY 99